A duck flying due east passes over Atlanta, where the magnetic field of Earth is 5.0 ✕ 10-5 T directed north. The duck has a positive charge of 3.2 ✕ 10-8 C. If the magnetic force acting on the duck is 3.0 ✕ 10-11 upward, what is the duck's velocity?

Why is metal often used for cooking pan?

Asher cycles 12 miles in 16 hours. what is his speed?

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?